Login to Zabbix admin site with admin user and move to [Configuration]-[Hosts] tab, and then click "Create Host" button.

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Input a hostname for "Hostname" field, input any name you like for "Visible name" field,
select a group or add a new group for "Groups" field, input IP address and DNS name for "Agent interfaces" field.
For other fields are optional. If it's OK all, move to "Templates" tab.